Explain how e. Coli controls the amount of transcription from the lac operon in all 3 conditions: 1) no lactose 2) lactose and glucose present, and 3) lactose present, and glucose absent.

Why do german shepherds shed so much

Match the following terms describing electrical events with the correct phases of the cardiac cycle. the ventricular muscle cells depolarize at the start of this phase. during this phase, na+ entry through the funny channels causes the pacemaker potential of sa nodal cells to gradually become less negative until it reaches threshold. the ventricular muscle cells repolarize right before this phase. the cytosolic concentration of calcium in the contractile cells of the ventricle is highest during this phase. a. isovolumetric relaxation b. ventricular ejection c. isovolumetric contraction d. ventricular filling

Many humans consume both plants and animals. these humans are considered to be which of the following? herbivores carnivores omnivores